Radio receiving apparatus.



J. A. PROCTOR. RADIO RECEIVING APPARATUS. APPLICATION FILED IAN. 29, 1914.

1,21 1,963. v Patented Jan. 9,1917.

5 nve Wcoz mounted as a spindle ll wh i n. Qt is a H l a curs APPARATUS COMPANY, GE 381535703X, YORK.

illiASSAGHUSE'ETS, A GQREQRATION GE EADEG REGEEVING APPARATU8.

Specification or Letters Eatent.

' enses.-

To all whom it may concern:

Be it known that I, Jenn A. Pacer-on, a citizen of the United States of America, and a resident of Revere, Massachusetts, have in vented certain new and useful improve ments in Radio Receiving Appzratus, principles of which are set forth in the following specification. and accompanying drawing, which disclose the form of the in vention which I now consider to he the best of the various forms in which the principles of the invention may be embodied.

This invention relates to improvements in radio receiving appa *atus, the object being such an apparatus which shall beada-pted to be operated by oscillations produced by continuous or undamped electric waves, without the employment of any form of make-and-break device which devices are disadvantageous because they cause a nonsinusoidalcurrent in the telephones with resulting. inefficient response.

The invention consists of the app and arrangements shown in the dra which are diagrammatic and in which con tinuously-variable condensers are shown in Figures 1 and 2 in different relations.

In both figures, A is the antenna, ground connection, P and S the g and secondary of the coupling finer, D the detector and T the telephones; also the arrow heads on connections irdicate instability. in Fig. 2 the te shunted by a fixed condenser C, but in 1 detector D is shunted around the phones T. In Fig. l, a condenser 1*; adiu able at the will of the operated, is Qi'illllfi to the secondary S, but in "2 this 5 denser is made continually variable. cordance with this invention, variation of the oscillations of the current delivered to the detector is made smooth, and preferably sinusoidal, between zero and maximum, by means of a continuously variable condenser. For example, as in Fig. l, condenser C is introduced between detector am secondary circuit S, K, its movable element he:

the

airy

tated (as by a motor) at r to 500 times a second, to vary the capacity duce a corresponding note in the c tee combination with an antenna,

. connected to vary iPatented Jan. 9,1931%.

Application filed Earle $29, 1914. Serial 3H0. 842L827.

smoothly from zero to mariimurn, and protelephones 1. I

In Fig. 2, the

manually adjustable condenser K of Fig.

1, an element of the second ary circuit with secondary Winding S, is re-' placed by condenser K which may be con structed and operated precisely like condenser C" of 1, just above described. But the electrical operation of this arrange ment is to vary smoothly the tune of the secondary circuit, whereby the energy of the received continuous oscillations is caused to produce a corresponding note in the telephones T.

Bearing in mind the fact that the varia tion required for the oscillations oi the current delivered to the detector, are of the order of several hundreds of periods per second, (in order to correspond the me chanical period of the elephone), the advan age wi be appreciated of employing this 391 pose a device which can he con-- structed to have a very light and well-balanced rotating part, such as the continuously tion. a method of varying the oscillations is, for that reason, far superior to any method involving a rotating coil of wire, for while such a device may be rotated sufficiently rapidly to merely operate, yet it is impracticable if not impossible, to rotate it fast enough to produce the desired high note c elephone.

l'n receiver of continuous oscillations,

of a detector and a telephone receiver, all cooperatively arranged, and a variable condenser the oscillations passing to the detector, said condenser being constructed to be continuously rotated at a high speed to produce oscillation-variations of a .requency corresponding to the operating period of the telephone receiver.

JQHN A.v PROCTSR.

Witne Louise M. Barnes,

Atom? 0. Annsnson. 

